6640489198 has 16 divisors (see below), whose sum is σ = 11404520064. Its totient is φ = 2840717880.

The previous prime is 6640489157. The next prime is 6640489201. The reversal of 6640489198 is 8919840466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425908 + ... + 441223.

It is an arithmetic number, because the mean of its divisors is an integer number (712782504).

Almost surely, 2^6640489198 is an apocalyptic number.

6640489198 is a deficient number, since it is larger than the sum of its proper divisors (4764030866).

6640489198 is a wasteful number, since it uses less digits than its factorization.

6640489198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867687.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 6640489198 is about 81489.1968177377. The cubic root of 6640489198 is about 1879.6054323228.

The spelling of 6640489198 in words is "six billion, six hundred forty million, four hundred eighty-nine thousand, one hundred ninety-eight".